Numbers Class 1 Worksheet Maths Chapter 11

Section A: Fill in the Blanks

Q1: The number 7 is an example of a ________ number.

Ans: Whole
Explanation: A whole number is an integer greater than or equal to zero.

Q2: The number 0 is an example of a ________ number.

Ans: Whole
Explanation: Zero is a whole number as it does not have a fractional or decimal part.

Q3: The number 100 is an example of a ________ number.

Ans: Three-digit
Explanation: A number with three digits is called a three-digit number.

Q4: A number that can only be divided by 1 and itself is called a ________ number.

Ans: Prime
Explanation: Prime numbers have only two factors, 1 and the number itself.

Q5: The smallest prime number is ________.

Ans: Two
Explanation: The number 2 is the smallest prime number.

Section B: True or False

Q1: The number 1 is considered a prime number. 

Ans: False
Explanation: The number 1 is not considered a prime number as prime numbers have exactly two factors.

Q2: The number 10 is divisible by 2. 

Ans: True
Explanation: 10 is divisible by 2 because it can be divided evenly by 2.

Q3: The sum of two odd numbers is always odd. 

Ans: False
Explanation: The sum of two odd numbers is always even.

Q4: A perfect square is a number that can be written as the product of two equal factors. 

Ans: False
Explanation: A perfect square is a number that can be written as the product of two equal factors, not necessarily different factors.

Q5: The number 1 is neither prime nor composite.

Ans: True
Explanation: The number 1 is neither prime nor composite as it does not meet the criteria for either.

Section C: Mixed Questions

Q1: Which number is divisible by both 2 and 3: 18, 25, or 36?

Ans: 36
Explanation: 36 is divisible by both 2 (18 ÷ 2) and 3 (18 ÷ 3).

Q2: What is the next prime number after 29?

Ans: 31
Explanation: After 29, the next prime number is 31.

Q3: Simplify: 4² + 3³ - 2²

Ans: 49
Explanation: 4² = 4 × 4 = 16, 3³ = 3 × 3 × 3 = 27, 2² = 2 × 2 = 4. Therefore, 16 + 27 - 4 = 49.

Q4: What is the value of the digit 8 in the number 3,825?

Ans: 8
Explanation: The digit 8 is in the thousands place in the number 3,825.

Q5: Which of the following is a composite number: 17, 21, or 23?

Ans: 21
Explanation: 21 is a composite number as it has factors other than 1 and itself (3 and 7).

Section D: Word Problems

Q1: A school has 360 students, and they are divided equally into 18 classrooms. How many students are there in each classroom?

Ans: 20
Explanation: To divide 360 students equally into 18 classrooms, we divide 360 by 18: 360 ÷ 18 = 20.

Q2: The sum of two numbers is 78. If one number is 45, what is the other number?

Ans: 33
Explanation: If the sum of two numbers is 78 and one number is 45, then the other number is 78 - 45 = 33.

Q3: A car traveled 280 kilometers in 4 hours. What is the average speed of the car?

Ans: 70 km/h
Explanation: Average speed is calculated by dividing the total distance traveled by the total time taken: 280 km ÷ 4 h = 70 km/h.

Q5: The price of a book is $25. If the bookstore offers a 15% discount, what will be the discounted price?

Ans: $21.25
Explanation: A 15% discount on a $25 book is calculated by multiplying 25 by 0.15 and subtracting it from 25: $25 - ($25 × 0.15) = $21.25.

Q5: John has saved $125 from his pocket money. If he saves $5 every week, how many weeks will it take for him to save $400?

Ans: 55 weeks
Explanation: To find the number of weeks, divide the desired amount to save by the amount saved per week: $400 ÷ $5 = 80 weeks.